Which app can i use to put my face on someone's body?

I have many pictures of celebrities with their fans and I want to be able to crop out their fan's face and put my face on their body. I just want to have fun and make it look funny. I need a VERY SIMPLE Iphone or Android app. Any suggestions?

I think you can do something like that with the face in hole app!

There are a few problems with that:

1) It is NOT called cropping. To crop a photo means to "cut away" information from one or more edges, in a straight line. You are asking about extracting an object/person, instead.

2) I doubt you care about the moral/legal issue, but still… Keep in mind that every photo has automatic copyright, so you really can't simply "take" it just because it is there. Try to ask permission from the photographer, or purchase one from a stock photo site (depending on your intentions for the photo).

3) If you want this to look real, both photos must have been taken with the same focal length, same distance, same angle, same light. If certain things don't match, the combination will never look quite "right".

4) I know there's a new catch phrase around: "There's an app for that", but guess what… Not EVERYTHING is done via apps.

Sometimes, we still need to learn how to do something and need to make an effort to get to the result.
Other times, there really IS an app for it, but doing it yourself the "hard" way gives far superior results.

Learn how to use a proper image "editing" program.
Adobe Photoshop, PS Elements, PaintShopPro, Gimp or even Photoscape (the last two are free).

Using a website is fine if you only want to do a few photos, but resident programs are the much better option if you have more or want to do this regularly. If it MUST be a free website, try http://pixlr.com/ or http://www.sumopaint.com/ or http://aviary.com/.

All of that type of stuff takes a little work, photoshop has always been the best for that stuff.